Here I Write about how the mapping can be done between logical, transport and physical channels. Not all physical channels are represented because not all physical channels correspond to a transport channel.

The mapping between logical channels and transport channels is done by the MAC sub-layer.

Channel mapping in umts

Different connections can be made between logical and transport channels:

  • BCCH is connected to BCH and may also be connected to FACH
  • DTCH can be connected to either RACH and FACH, to RACH and DSCH, to DCH and DSCH, to a DCH or a CPCH
  • CTCH is connected to FACH
  • DCCH can be connected to either RACH and FACH, to RACH and DSCH, to DCH and DSCH, to a DCH or a CPCH
  • PCCH is connected to PCH
  • CCCH is connected to RACH and FACH.

These connections depend on the type of information on the logical channels.

Where Channel Full name is as below,

  • BCCH – Broadcast Control Channel
  • DTCH – Dedicated Traffic Channel
  • RACH – Random Access Channel
  • FACH – Forward Access Channel
  • DSCH – Downlink Shared Channel
  • DCCH – Dedicated Control Channel
  • CPCH – Common Packet Channel
  • CTCH – Common Traffic Channel
  • DCH – Dedicated Transport Channel
  • PCCH – Paging Control Channel
  • PCH – Paging Channel
  • CCCH – Common Control Channel